<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212018000200343</article-id>
<article-id pub-id-type="doi">10.15517/ma.v29i2.29107</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Comportamiento agronómico y productivo de nuevas variedades de Cenchrus purpureus tolerantes a la sequía]]></article-title>
<article-title xml:lang="en"><![CDATA[Agronomic and productive performance of new drought tolerant Cenchrus purpureus cultivars]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ledea-Rodríguez]]></surname>
<given-names><![CDATA[José Leonardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ray-Ramírez]]></surname>
<given-names><![CDATA[Jorge Valentín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arias-Pérez]]></surname>
<given-names><![CDATA[Ramón Crucito]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Tejeda]]></surname>
<given-names><![CDATA[José Marcelino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosell-Alonso]]></surname>
<given-names><![CDATA[Giselle]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-Pérez]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Investigaciones Agropecuarias &#8220;Jorge Dimitrov&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto de Investigaciones Agropecuarias &#8220;Jorge Dimitrov&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Investigaciones Agropecuarias &#8220;Jorge Dimitrov&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto de Investigaciones Agropecuarias &#8220;Jorge Dimitrov&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto de Investigaciones Agropecuarias &#8220;Jorge Dimitrov&#8221;  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Técnica de Cotopaxi y Universidad Técnica Estatal de Quevedo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Ecuador</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2018</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>343</fpage>
<lpage>362</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212018000200343&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212018000200343&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212018000200343&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  La productividad de los pastos y forraje se ve cada vez más limitada por la variabilidad del clima y los prolongados tiempos de sequía, por lo que, es necesario introducir plantas que presenten tolerancia, y sean productivas en condiciones de sequía estacional. El objetivo de este trabajo fue caracterizar el comportamiento agronómico y productivo de nuevas variedades de Cenchrus purpureus tolerantes a la sequía. Se emplearon tres variedades (CT-601, CT-603 y CT-605) en diferentes edades de rebrote (60, 80, 100 y 120 días), en dos periodos climáticos: lluviosa y poco lluviosa de 2013 a 2014 en un ecosistema representativo del Valle del Cauto, Cuba. Las variedades estaban establecidas en un Vertisol y se fertilizaron con abono orgánico a razón de 25 t/ha. Se evaluaron algunas variables agronómicas y rendimiento de materia seca (MS) (t/ha) en condiciones de secano. Se empleó un diseño de bloques al azar con arreglo factorial, y su interacción (3x4x2). El rendimiento de MS fue afectado por la interacción de segundo grado, el mejor promedio (p&#8804;0,001) lo alcanzó el CT-605 en la época de lluvias a la edad de 120 días, en la época de pocas precipitaciones se destacaron (p&#8804;0,001) las variedades CT-603 y CT-605. El efecto de la interacción variedad con época/clima afectó significativamente (p&#8804;0,001) la longitud de las hojas a favor del CT-601 en la época lluviosa. El CT-605 incrementó (p&#8804;0,001) el porcentaje de hojas y tallos verdes en la estación de lluvias, en la época seca se igualaron los superíndices. Las variedades mostraron un aceptable rendimiento de MS en la época de pocas lluvias, los cambios en la morfología no afectaron el desarrollo ni su productividad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  The productivity of pastures and forage is increasingly limited due to climate variability and prolonged drought periods. For that reason, it is necessary to cultivate plants that are tolerant and productive under conditionsof seasonal drought. The objective of this work was to characterize the agronomic and productive performance of new drought tolerant Cenchrus purpureus cultivars. Three cultivars (CT-601, CT-603, and CT-605) were used at different regrowth ages (60, 80, 100, and 120 days) in two climatic periods: rainfall and low rainfall from 2013 to 2014 in a representative ecosystem of Cauto Valley, Cuba. The cultivars were grown on Vertisol and were fertilized with organic fertilizer at a rate of 25 t/ha. Some agronomic variables and dry matter (DM) yield (t/ha) were evaluated under rainfed conditions. A randomized block design with factorial arrangement and its interaction (3x4x2) was used. DM yield was affected by the the second order interaction, during the period of rainfall, CT-605 at the age of 120 days reached the best average (p&#8804;0.001) and during the period of low rainfall, CT-603 and CT-605 were highlighted (p&#8804;0.001) . Weather-season interaction on cultivars had a significantly positive impact (p&#8804;0.001) on the length of leaves of CT-601 in the period of rainfall. CT-605 increased (p&#8804;0.001) the percentage of leaves and green stems in the period of rainfall, superscripts were equalized in the dry season. Cultivars showed an acceptable DM yield during the low rainfall period, morphological changes neather affected the development nor the productivity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[rendimiento de cultivos]]></kwd>
<kwd lng="es"><![CDATA[Pennisetum purpureum]]></kwd>
<kwd lng="es"><![CDATA[adaptación fisiológica]]></kwd>
<kwd lng="es"><![CDATA[plantas forrajeras]]></kwd>
<kwd lng="en"><![CDATA[crop yield]]></kwd>
<kwd lng="en"><![CDATA[Pennisetum purpureum]]></kwd>
<kwd lng="en"><![CDATA[physiological adaptation]]></kwd>
<kwd lng="en"><![CDATA[forage crops]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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